Stars+-+LIfe+Cycle

Getting Started

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Rubric: [[file:Space Exploration Adventure Rubric.doc]], [[file:Space Exploration Adventure Rubric.pdf]]

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A nebula is the first s ta ge in a stars life. A nebula is made up of dust and gas. In some places gravity causes these to clump together. This means that the gravitational pull is stong, causing atoms to increase and other atoms being pulled into it too. The dust, gas, and atoms also help for other stages of the stars life cycle. A nebula forms into a main sequence star. A main seqence star shines as nuculear reactions inside produce light and heat. The main seqence star can change into a super giant or a red giant. A super giant expands and cools then turns red. A reed giant expand and glows red as it cools. A super giant can turn into a super nova which blasts away outer layer then turns into a neutron star or a black hole. A red giant can turn into a planetay nebula, then to a white dwarf, then to a white dwarf cooling, then to a black dwarf.

Visuals Make sure to include the location of your images; add a caption with this information
 * [[image:http://3.bp.blogspot.com/_bb8eHBzOVX8/TEwlYUSnnyI/AAAAAAAAAGw/myC7u-_YU48/s1600/Life+cycle.JPG width="472" height="322" caption="http://3.bp.blogspot.com/_bb8eHBzOVX8/TEwlYUSnnyI/AAAAAAAAAGw/myC7u-_YU48/s1600/Life+cycle.JPG"]] || [[image:http://t3.gstatic.com/images?q=tbn:ANd9GcT2dXfd8BCYh_lZzI3nC67ShROyhwEvzVD2K16jiXg4qVu13xZd width="280" height="142" align="left" caption="http://mail.colonial.net/~hkaiter/astronomyimagesB/starlife.jpg"]] ||  ||
 * [[image:http://www.factmonster.com/images/ESCI168NEBULA002.jpg width="520" height="359" caption="http://www.factmonster.com/images/ESCI168NEBULA002.jpg"]] || [[image:http://www.buzzle.com/images/astronomy/stars/supernova.jpg width="260" height="232" caption="http://www.buzzle.com/images/astronomy/stars/supernova.jpg"]] ||  ||
 * [[image:http://www.nasa.gov/images/content/49886main_stellar1.gif width="160" height="160" align="left" caption="Pressure out=Gravity in"]] || [[image:http://www.nasa.gov/images/content/214548main_049_LifeCycle_Star.jpg width="226" height="170" align="bottom" caption="The beginning of a supernova explosion"]] ||  ||

**Works Cited** **Sources** : Include the source information for all of the magazine articles, reference sources (encyclopedias) and web site pages that were used to complete your project. The source information for encyclopedias may be found at the end or beginning of each entry in iCONN. When using periodicals, the publication information will be at the beginning or end of the article. This needs to be formatted for MLA standards. If it is not labeled 'Source Citation' it can be formatted appropriately by using EasyBib.com. You should use EasyBib for the web sites. The final Works Cited should be listed in alphabetical order by the first word of the source citation. "Milky Way." //Kids InfoBits Presents: Astronomy//. Gale, 2008. Reproduced in Kids InfoBits. Detroit: Gale, 2012. "The Milky Way." //WMAP's Universe//. NASA, 28 June 2010. Web. 06 Mar. 2012. . Vergano, Dan. "Galaxy Bracketed by Big Bubbles." //USA Today// 10 Nov. 2010: 05A. Web. 6 Mar. 2012.
 * Sample:**

[|A278600642&docType=GALE&role=AONE] http://hubblesite.org/gallery/wallpaper/pr1999020a/ http://www.enchantedlearning.com/subjects/astronomy/stars/lifecycle/ []
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**Topic: Research Focus**
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**Notes** ==== Include notes, statistics and facts that you will use to write your final paper. You may want to label sections of your notes to help you be more organized as you write. As you take notes from a source, you should list the source citation in the **Works Cited** section above. ====

[|A278600642&docType=GALE&role=AONE] http://www.enchantedlearning.com/subjects/astronomy/stars/lifecycle/ []
 * A nebula consists of dust and gas, and there are places where gravity causes these to clump together. This means their gravitational attraction to other atoms increases, pulling more atoms into the clump. The process where atoms fall into the clump and become part of the protostar is called accretion. To become a star, the protostar will need to achieve hydrostatic equilibrium by balancing the gravity, pulling atoms in, and the radiation pressure pushing heat and light out. When equilibrium is achieved, if a specific mass is not reached (around 0.08 times the mass of the Sun), the protostar will become a brown dwarf, but if this critical mass is reached, then nuclear fusion is able to begin, and the star is born, entering the main sequence .Main Sequence.The majority of a star's lifetime is spent during the main sequence, although the duration of this stage varies dramatically, depending on the mass of the star; our Sun is in the main sequence at the moment. This stage is spent fusing hydrogen into helium in the core of the star. When the hydrogen supply begins to run out in the core, the core becomes unstable and contracts. The outer shell, which is still mostly hydrogen, starts to expand, cooling and glowing red.http://hubblesite.org/gallery/wallpaper/pr1999020a/
 * A nebula globules of gas and dust; giant, gaseous pillars; young stars surrounded by debris disks; aging, massive stars; and a blue supergiant star . all various stages in star life.
 * Stars are born in nebulae. Huge clouds of dust and gas collapse under gravitational forces, forming protostars. These young stars undergo further collapse, forming main sequence stars. Stars expand as they grow old. As the core runs out of hydrogen and then helium, the core contacts and the outer layers expand, cool, and become less bright. This is a red giant or a red super giant (depending on the initial mass of the star). It will eventually collapse and explode. Its fate is determined by the original mass of the star; it will become either a black dwarf, neutron star, or black hole.
 * The Sun and other stars shine as a result of nuclear reactions deep in their interiors. These reactions change light elements into heavier ones and release energy in the process. The outflow of energy from the central regions of the star provides the pressure necessary to keep the star from collapsing under its own weight. A star collapses when the fuel is used up and the energy flow from the core of the star stops. Nuclear reactions outside the core cause the dying star to expand outward in the "red giant" phase before it begins its inevitable collapse.